revert: remove graceful streaming pull shutdown #315
Merged
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Reverts #292
Release 2.4.0 which contains this feature has been yanked from PyPi: https://pypi.org/project/google-cloud-pubsub/
Graceful streaming pull shutdown introduces an optional wait on callbacks on streaming pull futures. It would otherwise break the streaming pull future returned by the Pub/Sub Lite subscriber client. See googleapis/python-pubsublite#95